Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d5d65e9753422a…

MALICIOUS

PDF

105.8 KB Created: 2021-03-28 12:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 629b641c819c5c761bada83b43801bdd SHA-1: a0eefa54ecbf2701e3df42fbfb701cb93e8d0b2a SHA-256: 38d5d65e9753422a09fccad06902ee4b7a2ceb20412a96aeb7672cc7ed402c45
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=fifa+ballon+d+or+2020+voting+results+pdf PDF link annotation
    • http://kataeta.club/manualidades_con_reciclado_de_botellastdcbp.pdfIn PDF document text
    • http://legionmone.xyz/warframe_simaris_target_guide0ndem.pdfIn PDF document text
    • http://legendnat.space/hp_4630_ink_cartridge1h3xs.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/african_holistic_health_book_freezqubb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384167/normal_5ffb31adc556f.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://workmonster.net/diamond_quest_don_t_rush_tibet_level_10tbmb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_60368362b1a25.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/YRwjhaP/kujawof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483839/normal_6034d27302b32.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/fjtDUig/repost_instagram_story_you_re_tagged_in.pdfIn PDF document text
    • http://subfamjtii.site/597149893340zuz3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_471e9783c9654720848a195bfff307d7.pdf?index=trueIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_fe4204d165f34864b16b209ac2be405f.pdf?index=trueIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_98b08b78521a41608387747cdea690a7.pdf?index=trueIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_077c651ecf9a47b5bf471db4a603484a.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_5b76ef86f9414492b602774e1f0e31be.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_89be2c50a4d94b1993524f987a1e05dc.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 2988 bytes
SHA-256: 42e3783caedf448e14fcbc75b18e161657efc393aa677f58ca9a5bff480967cb
font_01_sfnt_off00012dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCA 5640 bytes
SHA-256: 7836c5f49a69e3ce8fe570f48316decf8803c5a095d4bbb839fb8a62f70b613c
font_02_sfnt_off0001410a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410A 6152 bytes
SHA-256: ee869f038b52e612fa002300e12c6679a94912e1df1f1ba0216bfa60d873f619
font_03_sfnt_off00015540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15540 15232 bytes
SHA-256: 2879e83cc692471f446bc54326f8e8709f4e96e5eba31fa7efa185e01a0b4523
font_04_sfnt_off0001831e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1831E 16256 bytes
SHA-256: 1af46a7e6f387ca25cc342f1c8c48b2aa965a5dd9d4199c9167d4a73dc0d8c82